6.6

(a) Estimate the terminal speed of a wooden sphere (density 0.870 g/cm³) falling through air, if its radius is 7.00 cm and its drag coefficient is 0.500. (The density of air is 1.20 kg/m³.)
m/s

(b) From what height would a freely falling object reach this speed in the absence of air resistance?
m

A disk with m=4.4 kg and radius 14.1 cm rolls a distance 4.3 m down a ramp that is inclined by an angle 26.9° with respect to the horizontal. At the bottom of the ramp, what is its translational kinetic energy?

Physics Lab: Speed of Sound

Please answer what you can!

Physics Pre Lab 13: Speed of Sound

1) Why is it important to measure the temperature of the room when performing the experiment?

2) What is a standing wave? Explain in words as well as in an equation.

3) The fundamental node occurs when the water level has dropped to what percentage of a wavelength?

4) Explain why in fluids only longitudinal waves can propagate through them.

5) If you have a tuning fork with frequency 304 Hz, and you calculate the wavelength to be 53.2 cm, what is the speed of sound? Use MKS units.

A major league pitcher stands on the pitching mound 60ft 6in from home plate throws a fastball at 105 mph. Assume both the batter and pitcher are the same height (6ft 6in) and the ball is released 55 inches above the ground when thrown horizontal.

1. How far will a 340 gram baseball travel before hitting the ground?
2. How high is the ball above the ground when it passes over home plate?
3. How long does it take to reach home plate?

Now let’s look at what happens when the ball is hit, using the setup from the last problem. When hit the ball’s speed is an average of 30% faster and leaves the bat at a 5 degree angle.

4. How high is the ball when it passes the pitching mound?
5. How far will the ball travel?

A block of mass m₁ = 1.33 kg and a block of mass m₂ = 10.4 kg are connected by a massless string over a pulley in the shape of a solid disk having radius R = 0.250 m and mass M = 3 kg. The fixed, wedge-shaped ramp makes an angle of θ = 30.0° as shown in the figure. The coefficient of kinetic friction is 0.44 for both blocks. Determine the acceleration of the blocks.

A cylindrical rod 25.0 cm long with a mass of 1.20 kg and a radius of 1.50 cm has a ball of diameter of 7.90 cm and a mass of 2.00 kg attached to one end. The arrangement is originally vertical and stationary, with the ball at the top. The apparatus is free to pivot about the bottom end of the rod.

(a) After it falls through 90°, what is its rotational kinetic energy?
J
(b) What is the angular speed of the rod and ball?
rad/s
(c) What is the linear speed of the ball?
m/s
(d) How does this compare with the speed if the ball had fallen freely through the same distance of 29.0 cm?
v_swing is  ---Select--- greater than less than v_fall by  %

what care must the person administering the treatment take

The current through a 83 m long wire connected to a battery is 2.7 A. A section of the wire is cut off and used to build a circuit. When the remaining wire is connected to the same battery as before the current in the wire is 3.9 A. How much wire is left?

describe the process of fractional distillation of petroleum and explain the purpose of this process ? (type here please in simple language)

A rocket with mass 4.00×10³ kg is in a circular orbit of radius 7.40×10⁶ m around the earth. The rocket's engines fire for a period of time to increase that radius to 8.90×10⁶ m, with the orbit again circular.

a) What is the change in the rocket's kinetic energy? Does the kinetic energy increase or decrease?

b) What is the change in the rocket's gravitational potential energy? Does the potential energy increase or decrease?

c) How much work is done by the rocket engines in changing the orbital radius

Compute the volume of each spring and it's uncertainty using error propagation.

What is the formula for finding Volume of a spring? Not sure if any of these help but these are my data from my lab. I just don't know what the formula is, to put it to use. And if anyone can help with error propagation with the volume, that would help alot too.

The length is .1310m
spring diameter is .01425m
wire diameter is .00075m
coil # 165
mass is .02780kg

(a) You took two 50-g ice cubes from your −15 C kitchen freezer and placed them in 200 g of water in a thermally insulated container. If the water is initially at 25 C, what is the final temperature at thermal equilibrium? (b) What is the final temperature if only one ice cube is used? Hint: Watch out for the different possibilities!